Method of and mold for casting chilled rolls.



Patented Oct. l7, I899.

NG CHILLED ROLLS.

E. E. KAYE. METHOD OF AND HOLD FOR CAST! N Model.

Apphcation flied July 1, 1898 llllllllllllllllllllllll ll NITED STATESATENT FFICE" ELLSWORTH E. KAYE, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TOTHE ROBIN SON-REA MANUFACTURING COMPANY, OF SAME PLACE.

METHOD OF AND MOLD FOR CASTING CHILLED ROLLS.

SPECIFICATION forming part of Letters Patent No. 635,255, dated October17, 1899.

Application filed July 1, 1898, Serial No. 6 84,966. (N0 odem T0 ctZZwhom, it may concern.-

Be it known that I, ELLSWORTH E. KAYE, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in the Manufacture of Chilled Rolls and Chill-MoldsTherefor, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification, in which- Figure 1 is a vertical section ofmy improved chill, showing the roll therein before cooling. Fig. 2 isthe same view showing the roll after cooling, and Fig. 3 is across-section on line III III of Fig. 2.

Myinvention relates to the casting of chilled rolls of plain cylindricalshape and is designed to provide means for producing a chill of an evenand uniform depth and also to counteract the effect of shrinkage incasting in the roll during cooling; and it consists, broadly, in achill-mold whose inner surface is slightly tapered downwardly, theamount of said taperv being determined by the size and shape of thedesired roll and the character of the metal used.

The difficulties attendant upon the use of the heretofore-knowncylindrical chill-molds have been, first, to obtain a uniform depth ofchill, since the metal in cooling contracts and parts of the surface ofthe roll will cease to be in contact With the chill-mold, thus causingthe action of the chill-mold to cease at such portions of the surface ofthe roll, and, second, the shrinkage of the roll being greater at thetop than at the bottom of the chillmold it has been necessary afterremoval from the chill-mold to turn down the lower portion of thesurface of the roll upon the lathe, thus entailing an increase in thecost of production and causing a further difference in the depth of thechill. By the use of my invention I entirely overcome these difficultiesand am enabled to produce rolls of perfectly cylindrical form and evendepth of chill without further manipulation after removal from the mold.

In the drawings, 2 is my improved chillmold having roll 3 therein, and Ishow by dotted lines the cope and drag, which may be three-fourths of aninch.

of any desired character, since they do not form a feature of myinvention.

4 4: are the journals, and 5 5 the coupling ends, of the roll.

The roll shown in the drawings is what is known as a tin-plate roll andis of a class of rolls which I deem most suitable to illustrate myinvention. It is designed to repre= sent what is technically known tothe trade As 'i s well known, after a roll has been received at the milland before it is put into actual use it undergoes what is known asdressing, in which operation a small portion of its surface is turnedoff. To allow for this, I aim to produce a roll that when the chill-moldis removed therefrom will be about twenty-four and seven-sixteenthsinches in diameter. Having discovered by experiment that while thediameter of the bottom end of a roll of this size in cooling will bereduced about seven-sixteenths of an inch by reason of the shrinkage ofthe metal, the diameter of the upper end thereof will be reduced about Itherefore construct my chill-mold with an internal diameter of abouttwenty-five and three-sixteenths inches at the upper end thereof and. aninternal diameter of about twenty-four and seven-eighths inches at itslower end, so that the chill-mold cavity shall be that of an invertedfrustum of a cone. As to the height of said chill-mold cavity I havefound that a roll of thirty-two inches in length will shrink aboutone-fourth of an inch in length, and I therefore give my chill-moldcavity a height of about thirty-two and three-fourths inches to allowboth for the said shrinkage and the subsequent dressing at the mill.

In casting a roll with my improved chillmold I proceed in the usualmanner. Suitable cope and drag containing the sand for forming thejournals and couplings and a suitable flask for pouring are provided.

I show in Fig. l the position of the molten metal in contact with themold and in Fig. 2 the formed roll after shrinkage of the metal hasceased. It will be apparent that by reason of the taper in the sides ofthe chillmold cavity the metal while cooling will be supported centrallyin said chill-mold, thus permitting its efficient action throughout theentire operation.

hen the roll is cool I lift the chill-mold from the roll by any suitablemeans, and the roll is then ready for shipment.

The advantages to be derived from the use of my invention will beapparent to those familar with the art of casting chilled rolls, since Iam able to obtain a roll having a chilled surface of uniform depth andhaving a uniform diameter. I do not have to further manipulate the rollafter removing the chill, but am able to immediately ship the same, thusaitording a reduction in the cost of manufacture. The construction ofthe chill-mold itself involves but little cost either in material orlabor, thus effecting a further saving.

It will be readily understood that various changes Within the scope ofthe claims may be made in the construction and application of mychill-mold Without departure therefrom, since I do not limit myself tothe particular application as herein described. Other classes and sizesof rolls may be cast with modifications in the chill-mold and changesmay be made in the other parts of the mold without departure from myinvention, since What I claim is 1. Apparatus for casting substantiallycylindrical rolls with a practically uniformdepth of chill consisting ofa chill-mold the surface of Whose matrix-cavity is substantially that ofa frustum of a cone substantially as described.

2. The method of making substantially cylindrical rolls, consisting incasting the metal in a chill-mold having a frnsto-conical matrixoavity,with its larger end upward, and cooling the outer portion of the castroll in contact with said mold in such a way as to cause the larger endof the roll to contract to substantially the same final diameter as thatof the smaller end; substantially as described.

In testimony whereof I have hereunto set my hand.

E'LLS\VORTII E. KAYE.

\Vitnesses:

M. S. MURPHY, GEORGE I. I'IOLDSHIP.

